Prague Astronomical Clock | Prague

Information

Landmark: Prague Astronomical Clock
City: Prague
Country: Czech Republic
Continent: Europe

Prague Astronomical Clock, Prague, Czech Republic, Europe

The Prague Astronomical Clock, or Orloj, is a medieval horologe mounted on the southern wall of the Old Town Hall in Prague, Czech Republic. It is the oldest astronomical clock still in operation, having tracked solar and lunar cycles since the early 15th century.

Visual Characteristics

The clock consists of three main components: an astronomical dial, a calendar dial, and a set of mechanical figures. The upper astronomical dial is a mechanical astrolabe made of iron and painted steel, displaying the movement of the sun and moon through the zodiac. Below it, the calendar dial features 12 medallions depicting the months, surrounded by a copper plate. Two blue doors above the astrolabe open hourly to reveal moving wooden sculptures of the Twelve Apostles.

Location & Access Logistics

The clock is located on the facade of the Old Town Hall at Staroměstské náměstí 1/3. It is reachable via the Staroměstská metro station (Line A), approximately 300 meters away. Tram lines 2, 17, and 18 stop at the nearby Staroměstská station. Access is strictly pedestrian; the closest vehicle drop-off points are near the InterContinental Hotel or Jan Palach Square.

Historical & Ecological Origin

The mechanical clock and astronomical dial were constructed in 1410 by clockmaker Mikuláš of Kadaň and Jan Šindel, a professor of mathematics and astronomy at Charles University. The calendar dial and Gothic sculptures were added around 1490, and the wooden Apostle figures were introduced during a restoration between 1865 and 1866.

Key Highlights & Activities

Every hour on the hour, the mechanical "Procession of the Apostles" occurs, concluding with the crowing of a golden rooster at the top of the clock. Observers can identify the current Babylonian time, Old Bohemian time, and Central European time on the main dial. Tickets can be purchased to enter the Old Town Hall to view the internal mechanism of the clock from the inside.

Infrastructure & Amenities

Restrooms are available inside the Old Town Hall tourist information center immediately adjacent to the clock. No shade exists in the viewing area, as it is an open public square. 5G cellular connectivity is highly stable. Information plaques are mounted nearby, and the area is surrounded by permanent retail and dining establishments.

Best Time to Visit

The clock operates 24 hours a day, but the mechanical figures move only from 09:00 to 21:00. Morning hours before 10:00 provide the best conditions for unobstructed viewing. For photography, late afternoon sun illuminates the facade directly, highlighting the gold leaf details on the astrolabe.

Facts & Legends

Local legend claims that the city council blinded the clockmaker Hanuš to prevent him from replicating the masterpiece elsewhere. In retaliation, Hanuš reportedly reached into the gears to stop the clock, dying in the process and cursing the mechanism to remain broken for decades.